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US President Donald Trump says a claim that he made insensitive remarks to the recently bereaved widow of a soldier is "totally fabricated".
Congresswoman Frederica Wilson said he had told the widow of Sgt La David Johnson: "He knew what he was signing up for, but I guess it hurts anyway."
The Democratic lawmaker said she was shocked by the alleged comments.
Sgt Johnson was among four US special service soldiers killed in Niger by Islamist militants this month.
Mr Trump had already been criticised for not contacting the families of the dead servicemen right after the fatal ambush on 4 October.
The president tweeted on Wednesday morning: "Democrat Congresswoman totally fabricated what I said to the wife of a soldier who died in action (and I have proof). Sad!"
Mr Trump did not immediately provide the evidence.
A White House official said Mr Trump's conversations with the families of dead servicemen were private.
Ms Wilson, who represents a Florida district, told CNN the president's call had been made shortly before Sgt Johnson's coffin arrived in Miami.
"This gentleman has a brain disorder," said the lawmaker, "and he needs to be checked out."
Ms Wilson told WPLG, a Miami TV station, she had heard the president's "so insensitive" remarks to the widow on speakerphone in a limousine.
"Yeah, he [President Trump] said that," Ms Wilson said. "To me, that is something that you can say in a conversation, but you shouldn't say that to a grieving widow.
Image copyright Frederica Wilson / Facebook
Image caption Frederica Wilson (R) pictured in 2015 with former President Barack Obama
"And everyone knows when you go to war, you could possibly not come back alive. But you don't remind a grieving widow of that."
Ms Wilson told the Washington Post the widow, Myeshia Johnson, who is expecting the couple's third child, had broken down in tears after the conversation.
"He made her cry," Ms Wilson said.
The congresswoman told the newspaper that she had wanted to grab the phone and "curse him out".
But an army sergeant who was holding the handset would not let her speak to the president, she said.
The full context of the conversation is not known. Ms Wilson said that when she had asked Ms Johnson about the exchange, she said she could not remember.
The congresswoman later responded to Mr Trump's denial by tweeting: "I stand my account of the call with @realDonaldTrump and was not the only one who heard and was dismayed by his insensitive remarks."
Mr Trump has been on the defensive over the deaths in Niger since a reporter asked him at the White House on Monday why he had still not called the families.
He provoked fury by falsely claiming that his predecessor, Barack Obama, and other former US presidents had not called the relatives of dead service members.
Mr Trump also said he had written letters to the families of the four killed in Niger and planned to call them soon.
The White House later said the president had spoken to the families but it did not say when.
On Tuesday, Mr Trump ratcheted up the row by suggesting that President Obama had not called the family of Mr Trump's chief of staff, Gen John Kelly, when his son was killed in Afghanistan in 2010.
The Associated Press says that like presidents before him, Mr Trump has made personal contact with some families of dead soldiers - but not all.
"What's different is that Trump, alone among them, has picked a political fight over who's done better to honour the war dead and their families," the news agency reports.
"He placed himself at the top of this pantheon, boasting Tuesday that 'I think I've called every family of someone who's died' while past presidents didn't place such calls."
This is not the first time Mr Trump has found himself in an imbroglio over US veterans.
As presidential candidate, he mocked Senator John McCain for having been captured as a prisoner of war in Vietnam.
He also engaged in a racially charged feud with the parents of decorated army captain Humayun Khan, who was killed in Iraq in 2004.
